fixed typo

git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@9260 2fb0f335-1f38-0410-981e-8018bf24f1b0

dumux/material/constraintsolvers/misciblemultiphasecomposition.hh

@@ -141,7 +141,7 @@ public:
         }
 
         // assemble the equations expressing the fact that the
-        // fugacities of each component is equal in all phases
+        // fugacities of each component are equal in all phases
         for (int compIdx = 0; compIdx < numComponents; ++compIdx) {
             Scalar entryCol1 =
                 fluidState.fugacityCoefficient(/*phaseIdx=*/0, compIdx)